Postpartum 10 months, still haven’t gotten my period

I am postpartum 10 month and trying to conceive my second but haven’t gotten my period! TTC FOR ABOUT 3 months and have been un successful. I ha w been brest feeding still but only about once or twice a day. I have done the ovulation kits and so far this app and the ovulation kits seem to be lining up correctly. Anyone have any advice?